18223201238819 has 2 divisors, whose sum is σ = 18223201238820. Its totient is φ = 18223201238818.

The previous prime is 18223201238789. The next prime is 18223201238839. The reversal of 18223201238819 is 91883210232281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18223201238819 - 2³² = 18218906271523 is a prime.

It is a super-2 number, since 2×18223201238819² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18223201238839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111600619409 + 9111600619410.

It is an arithmetic number, because the mean of its divisors is an integer number (9111600619410).

Almost surely, 2^{18223201238819} is an apocalyptic number.

18223201238819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18223201238819 is an equidigital number, since it uses as much as digits as its factorization.

18223201238819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 18223201238819 in words is "eighteen trillion, two hundred twenty-three billion, two hundred one million, two hundred thirty-eight thousand, eight hundred nineteen".